Extract version qualifier into standalone script

Author: donoghuc

.buildkite/pull_request_pipeline.yml

@@ -136,7 +136,12 @@ steps:
         - limit: 3
     command: |
       set -euo pipefail
-      ci/run-observability-sre-container-smoketest.sh
+      source .buildkite/scripts/common/vm-agent.sh
+      # Provides QUALIFIED_VERSION
+      source ci/version-qualifier.sh
+      ./gradlew --stacktrace artifactDockerObservabilitySRE
+      docker run docker.elastic.co/logstash/logstash-observability-sre:${QUALIFIED_VERSION} \
+        logstash -e 'input { generator { count => 3 } } output { stdout { codec => rubydebug } }'
 
   - label: ":lab_coat: Integration Tests - FIPS mode / part 1"
     key: "integration-tests-fips-part-1"

ci/run-observability-sre-container-smoketest.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+# *********************************************************
+# This file provides the qualified version, considering the
+# contents of /versions.yml, VERSION_QUALIFIER, and RELEASE
+# *********************************************************
+
+set -euo pipefail
+
+export QUALIFIED_VERSION="$(
+  # extract logstash version from versions.yml
+  printf "$(awk -F':' '{ if ("logstash" == $1) { gsub(/^ | $/,"",$2); printf $2; exit } }' versions.yml)"
+
+  # append the VERSION_QUALIFIER if it is present
+  printf "${VERSION_QUALIFIER:+-${VERSION_QUALIFIER}}"
+
+  # add the SNAPSHOT tag unless RELEASE=1
+  [[ "${RELEASE:-0}" == "1" ]] || printf "-SNAPSHOT"
+)"
+
+if [[ "$0" == "${BASH_SOURCE[0]}" ]]; then
+  printf "${QUALIFIED_VERSION}"
+fi